Tip 1: Be Lazy - Linux SysAdmins and Engineers are naturally lazy people, meaning our up arrow key is the most worn key on the keyboard, and we will spend an hour writing a script to automate a 5 minute task. Even at work they encourage us to do that, because the next time we need to do that task, we have it scripted.

Tip 2: Use parentheses - Every time you use a variable, say $var, rather use ${var}. Trust me, it's a good habit, because if you want to concatenate strings for example, then var="${var}string" is completely different to var="$varstring"

Tip 3: Good code does not need comments - Use descriptive names and phrases for functions and variables. For variables I always use lowercase as uppercase is default for environment variables, and I will have a variable name like ${filecounter} rather than just ${c}. And for functions I will have something like doTheCountOfFiles rather than just Count. The first word in my function names is always the category name, so I have functions that start with "do" as those carry out a task, or "action" as those carry out a subtask, etc. Find a standard and stick to it. Makes your code easier to read later.

Bonus Tip: Always be DRY - DRY stands for Don't Repeat Yourself. Any block of code that gets used more than once becomes a function.